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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 252b83d405881047b5679aaa3c610d5cc83b0e0a / . / docs / ReleaseNotes.html
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4<head>
Reid Spencer6454ed32004-11-18 18:38:58 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]7 <title>LLVM 2.2 Release Notes</title>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]8</head>
9<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]10
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]11<div class="doc_title">LLVM 2.2 Release Notes</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]12
13<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]14 <li><a href="#intro">Introduction</a></li>
15 <li><a href="#whatsnew">What's New?</a></li>
Chris Lattner4b538b92004-04-30 22:17:12 +0000[diff] [blame]16 <li><a href="GettingStarted.html">Installation Instructions</a></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]17 <li><a href="#portability">Portability and Supported Platforms</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]18 <li><a href="#knownproblems">Known Problems</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]19 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]20</ol>
21
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]22<div class="doc_author">
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]23 <p>Written by the <a href="http://llvm.org">LLVM Team</a><p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]24</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]25
26<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]27<div class="doc_section">
28 <a name="intro">Introduction</a>
29</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]30<!-- *********************************************************************** -->
31
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]32<div class="doc_text">
33
34<p>This document contains the release notes for the LLVM compiler
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]35infrastructure, release 2.2. Here we describe the status of LLVM, including
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]36major improvements from the previous release and any known problems. All LLVM
Chris Lattnercaf06342007-05-09 04:58:11 +0000[diff] [blame]37releases may be downloaded from the <a href="http://llvm.org/releases/">LLVM
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]38releases web site</a>.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]39
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]40<p>For more information about LLVM, including information about the latest
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]41release, please check out the <a href="http://llvm.org/">main LLVM
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]42web site</a>. If you have questions or comments, the <a
43href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]44list</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]45
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]46<p>Note that if you are reading this file from a Subversion checkout or the
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]47main LLVM web page, this document applies to the <i>next</i> release, not the
48current one. To see the release notes for a specific releases, please see the
49<a href="http://llvm.org/releases/">releases page</a>.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]50
51</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]52
53<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]54<div class="doc_section">
55 <a name="whatsnew">What's New?</a>
56</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]57<!-- *********************************************************************** -->
58
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]59<div class="doc_text">
60
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]61<p>This is the thirteenth public release of the LLVM Compiler Infrastructure.
62It includes many features and refinements from LLVM 2.1.</p>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]63
Chris Lattner80453c92004-05-24 04:50:25 +0000[diff] [blame]64</div>
65
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]66<!--=========================================================================-->
Chris Lattner8a458762005-05-15 05:44:51 +0000[diff] [blame]67<div class="doc_subsection">
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]68<a name="frontends">llvm-gcc 4.0, llvm-gcc 4.2, and clang</a>
Chris Lattner44c933e2006-04-18 06:18:36 +0000[diff] [blame]69</div>
70
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]71<div class="doc_text">
Chris Lattner60893e52007-05-18 06:33:02 +0000[diff] [blame]72
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]73<p>LLVM 2.2 fully supports both the llvm-gcc 4.0 and llvm-gcc 4.2 front-ends (in
74LLVM 2.1, llvm-gcc 4.2 was beta). Since LLVM 2.1, the llvm-gcc 4.2 front-end
75has made leaps and bounds and is now at least as good as 4.0 in virtually every
76area, and is better in several areas (for example, exception handling
77correctness). We strongly recommend that you migrate from llvm-gcc 4.0 to
78llvm-gcc 4.2 in this release cycle because <b>LLVM 2.2 is the last release
79that will support llvm-gcc 4.0</b>: LLVM 2.3 will only support the llvm-gcc
804.2 front-end.</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]81
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame^]82<p>The <a href="http://clang.llvm.org/">clang project</a> is an effort to build
83a set of new 'llvm native' front-end technologies for the LLVM optimizer
84and code generator. Currently, its C and Objective-C support is maturing
85nicely, and it has advanced source-to-source analysis and transformation
86capabilities. If you are interested in building source-level tools for C and
87Objective-C (and eventually C++), you should take a look. However, note that
88clang is not an official part of the LLVM 2.2 release. If you are interested in
89this project, please see the web site.</p>
90
91</div>
92
93<!--=========================================================================-->
94<div class="doc_subsection">
95<a name="majorfeatures">Major New Features</a>
96</div>
97
98<div class="doc_text">
99
100<p>Dale contributed full support for long double on x86/x86-64 (where it is 80
101bits) and on Darwin PPC/PPC64 (where it is 128 bits).</p>
102
103<p>Ada, gfortran</p>
104
105<p>
106debug improvements -O0
107EH.
108
109Gordon: GC Revamp. docs/GarbageCollection.html
110
111Kaleidescope: docs/tutorial
112
113Gordon: C and Ocaml Bindings
Chris Lattner60893e52007-05-18 06:33:02 +0000[diff] [blame]114
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]115</div>
116
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]117<!--=========================================================================-->
118<div class="doc_subsection">
119<a name="optimizer">Optimizer Improvements</a>
120</div>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]121
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]122<div class="doc_text">
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]123
Chris Lattnerd4298712007-09-26 05:44:21 +0000[diff] [blame]124<p>Some of the most noticable feature improvements this release have been in the
125optimizer, speeding it up and making it more aggressive. For example:</p>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]126
127<ul>
Tanya Lattnerb6ec3a92007-05-16 23:25:46 +0000[diff] [blame]128
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame^]129<li>Daniel Berlin and (?) rewrote Andersen's alias analysis (which is not
130enabled by default) to be several orders of magnitude faster, implmented Offline
131Variable Substitution.</li>
Tanya Lattnerb6ec3a92007-05-16 23:25:46 +0000[diff] [blame]132
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame^]133
134Devang: LoopIndexSplit is enabled by default.
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]135</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]136
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]137</div>
138
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]139<!--=========================================================================-->
140<div class="doc_subsection">
141<a name="codegen">Code Generator Improvements</a>
142</div>
143
144<div class="doc_text">
145
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame^]146<p>foci of this release was performance tuning and bug
Chris Lattnerd4298712007-09-26 05:44:21 +0000[diff] [blame]147 fixing. In addition to these, several new major changes occurred:</p>
148
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]149<ul>
150
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame^]151<li>Owen contributed Machine Loop info, domintors, etc.</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]152
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame^]153<li>Dan added support for emitting debug information with .file and .loc on
154targets that support it</li>
155
156<li>Evan physical register dependencies in the BURR scheduler</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]157</ul>
158
159</div>
160
161
162<!--=========================================================================-->
163<div class="doc_subsection">
164<a name="targetspecific">Target Specific Improvements</a>
165</div>
Chris Lattner60893e52007-05-18 06:33:02 +0000[diff] [blame]166
Chris Lattner738bd302006-04-18 06:32:08 +0000[diff] [blame]167<div class="doc_text">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]168<p>New features include:
169</p>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]170
171<ul>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame^]172<li>Evan X86 now models EFLAGS in instructions.</li>
173<li>Evan: If conversion on by default for ARM.</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]174</ul>
175
176</div>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]177
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]178
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]179<!--=========================================================================-->
180<div class="doc_subsection">
181<a name="llvmgccimprovements">llvm-gcc Improvements</a>
182</div>
Tanya Lattnerb6ec3a92007-05-16 23:25:46 +0000[diff] [blame]183
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]184<div class="doc_text">
185<p>New features include:
186</p>
Tanya Lattnerb6ec3a92007-05-16 23:25:46 +0000[diff] [blame]187
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]188<ul>
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]189<li>.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]190</ul>
191
Chris Lattner738bd302006-04-18 06:32:08 +0000[diff] [blame]192</div>
193
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]194
195<!--=========================================================================-->
196<div class="doc_subsection">
197<a name="coreimprovements">LLVM Core Improvements</a>
198</div>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]199
Chris Lattner1c1a85c2006-04-19 04:02:47 +0000[diff] [blame]200<div class="doc_text">
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]201<p>New features include:
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]202</p>
203
204<ul>
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]205<li>.</li>
Chris Lattnerbfb17ab2007-05-17 21:41:31 +0000[diff] [blame]206</ul>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]207
Chris Lattnerbfb17ab2007-05-17 21:41:31 +0000[diff] [blame]208</div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]209
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]210<!--=========================================================================-->
211<div class="doc_subsection">
212<a name="otherimprovements">Other Improvements</a>
213</div>
214
215<div class="doc_text">
216<p>New features include:
217</p>
218
219<ul>
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]220<li>.</li>
Chris Lattner84977642007-09-21 03:54:09 +0000[diff] [blame]221</ul>
222
223</div>
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]224
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]225<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]226<div class="doc_section">
227 <a name="portability">Portability and Supported Platforms</a>
228</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]229<!-- *********************************************************************** -->
230
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]231<div class="doc_text">
232
John Criswell0b5b5e92004-12-08 20:35:47 +0000[diff] [blame]233<p>LLVM is known to work on the following platforms:</p>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]234
235<ul>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]236<li>Intel and AMD machines running Red Hat Linux, Fedora Core and FreeBSD
Reid Spencer00812e22005-05-17 02:47:27 +0000[diff] [blame]237 (and probably other unix-like systems).</li>
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]238<li>PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit and
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]239 64-bit modes.</li>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame^]240<li>Intel and AMD machines running on Win32 using MinGW libraries (native).</li>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]241<li>Intel and AMD machines running on Win32 with the Cygwin libraries (limited
242 support is available for native builds with Visual C++).</li>
243<li>Sun UltraSPARC workstations running Solaris 8.</li>
John Criswell9321fa82005-05-13 20:28:15 +0000[diff] [blame]244<li>Alpha-based machines running Debian GNU/Linux.</li>
245<li>Itanium-based machines running Linux and HP-UX.</li>
Chris Lattner4654bdb2004-06-01 18:22:41 +0000[diff] [blame]246</ul>
247
Brian Gaekeb0fd7612004-05-09 05:28:35 +0000[diff] [blame]248<p>The core LLVM infrastructure uses
249<a href="http://www.gnu.org/software/autoconf/">GNU autoconf</a> to adapt itself
250to the machine and operating system on which it is built. However, minor
251porting may be required to get LLVM to work on new platforms. We welcome your
252portability patches and reports of successful builds or error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]253
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]254</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]255
256<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]257<div class="doc_section">
258 <a name="knownproblems">Known Problems</a>
259</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]260<!-- *********************************************************************** -->
261
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]262<div class="doc_text">
263
264<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]265component. As new problems are discovered, they will be added to these
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]266sections. If you run into a problem, please check the <a
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]267href="http://llvm.org/bugs/">LLVM bug database</a> and submit a bug if
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]268there isn't already one.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]269
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]270</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]271
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]272<!-- ======================================================================= -->
273<div class="doc_subsection">
274 <a name="experimental">Experimental features included with this release</a>
275</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]276
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]277<div class="doc_text">
278
Misha Brukman6df9e2c2004-05-12 21:46:05 +0000[diff] [blame]279<p>The following components of this LLVM release are either untested, known to
280be broken or unreliable, or are in early development. These components should
281not be relied on, and bugs should not be filed against them, but they may be
282useful to some people. In particular, if you would like to work on one of these
Chris Lattner49e693e2006-08-09 04:08:52 +0000[diff] [blame]283components, please contact us on the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]284
285<ul>
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame^]286<li>The <tt>-cee</tt> pass is known to be buggy and will be removed in
287 LLVM 2.3.</li>
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]288<li>The MSIL, IA64, Alpha, and MIPS backends are experimental.</li>
289<li>The LLC "<tt>-filetype=asm</tt>" (the default) is the only supported
290 value for this option.</li>
291<li>The llvmc tool is not supported.</li>
Chris Lattnerf5ee1702004-03-14 02:03:02 +0000[diff] [blame]292</ul>
293
294</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]295
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]296<!-- ======================================================================= -->
297<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]298 <a name="x86-be">Known problems with the X86 back-end</a>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]299</div>
300
301<div class="doc_text">
302
303<ul>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]304<li>The X86 backend does not yet support <a href="http://llvm.org/PR879">inline
Chris Lattnercaf06342007-05-09 04:58:11 +0000[diff] [blame]305 assembly that uses the X86 floating point stack</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]306<li>The X86 backend occasionally has <a href="http://llvm.org/PR1649">alignment
307 problems</a> on operating systems that don't require 16-byte stack alignment
308 (including most non-darwin OS's like linux).</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]309</ul>
310
311</div>
312
313<!-- ======================================================================= -->
314<div class="doc_subsection">
315 <a name="ppc-be">Known problems with the PowerPC back-end</a>
316</div>
317
318<div class="doc_text">
319
320<ul>
Nicolas Geoffraye4285dc2007-05-15 09:21:28 +0000[diff] [blame]321<li>The Linux PPC32/ABI support needs testing for the interpreter and static
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]322compilation, and lacks support for debug information.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]323</ul>
324
325</div>
326
327<!-- ======================================================================= -->
328<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]329 <a name="arm-be">Known problems with the ARM back-end</a>
330</div>
331
332<div class="doc_text">
333
334<ul>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]335<li>Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]336processors, thumb programs can crash or produce wrong
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]337results (<a href="http://llvm.org/PR1388">PR1388</a>).</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]338<li>Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
339</li>
Chris Lattner57a460e2007-05-23 04:39:32 +0000[diff] [blame]340<li>There is a bug in QEMU-ARM (<= 0.9.0) which causes it to incorrectly execute
341programs compiled with LLVM. Please use more recent versions of QEMU.</li>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]342</ul>
343
344</div>
345
346<!-- ======================================================================= -->
347<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]348 <a name="sparc-be">Known problems with the SPARC back-end</a>
349</div>
350
351<div class="doc_text">
352
353<ul>
354<li>The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
355 support the 64-bit SPARC ABI (-m64).</li>
356</ul>
357
358</div>
359
360<!-- ======================================================================= -->
361<div class="doc_subsection">
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]362 <a name="alpha-be">Known problems with the Alpha back-end</a>
363</div>
364
365<div class="doc_text">
366
367<ul>
368
369<li>On 21164s, some rare FP arithmetic sequences which may trap do not have the
370appropriate nops inserted to ensure restartability.</li>
371
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]372</ul>
373</div>
374
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]375<!-- ======================================================================= -->
376<div class="doc_subsection">
377 <a name="ia64-be">Known problems with the IA64 back-end</a>
378</div>
379
380<div class="doc_text">
381
382<ul>
383
384<li>C++ programs are likely to fail on IA64, as calls to <tt>setjmp</tt> are
385made where the argument is not 16-byte aligned, as required on IA64. (Strictly
386speaking this is not a bug in the IA64 back-end; it will also be encountered
387when building C++ programs using the C back-end.)</li>
388
389<li>The C++ front-end does not use <a href="http://llvm.org/PR406">IA64
390ABI compliant layout of v-tables</a>. In particular, it just stores function
391pointers instead of function descriptors in the vtable. This bug prevents
392mixing C++ code compiled with LLVM with C++ objects compiled by other C++
393compilers.</li>
394
395<li>There are a few ABI violations which will lead to problems when mixing LLVM
396output with code built with other compilers, particularly for floating-point
397programs.</li>
398
399<li>Defining vararg functions is not supported (but calling them is ok).</li>
400
Chris Lattnercaf06342007-05-09 04:58:11 +0000[diff] [blame]401<li>The Itanium backend has bitrotted somewhat.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]402</ul>
403
404</div>
405
406<!-- ======================================================================= -->
407<div class="doc_subsection">
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]408 <a name="c-be">Known problems with the C back-end</a>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]409</div>
410
411<div class="doc_text">
412
413<ul>
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]414<li><a href="http://llvm.org/PR802">The C backend does not support inline
415 assembly code</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]416<li><a href="http://llvm.org/PR1126">The C backend does not support vectors
417 yet</a>.</li>
Chris Lattner725a0d82007-09-26 06:01:35 +0000[diff] [blame]418<li><a href="http://llvm.org/PR1658">The C backend violates the ABI of common
419 C++ programs</a>, preventing intermixing between C++ compiled by the CBE and
420 C++ code compiled with LLC or native compilers.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]421</ul>
422
423</div>
John Criswellc0c186d2005-11-08 21:11:33 +0000[diff] [blame]424
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]425
426<!-- ======================================================================= -->
427<div class="doc_subsection">
428 <a name="c-fe">Known problems with the C front-end</a>
429</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]430
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]431<!-- _______________________________________________________________________ -->
Chris Lattnerb40efb32003-12-14 05:03:43 +0000[diff] [blame]432<div class="doc_subsubsection">Bugs</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]433
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]434<div class="doc_text">
Chris Lattnerc5d658a2006-03-03 00:34:26 +0000[diff] [blame]435
Chris Lattner252b83d2008-02-06 18:00:06 +0000[diff] [blame^]436<p>llvm-gcc does not currently support <a href="http://llvm.org/PR869">Link-Time
437Optimization</a> on most platforms "out-of-the-box". Please inquire on the
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]438llvmdev mailing list if you are interested.</p>
Chris Lattnerd9ea0172006-08-08 17:27:28 +0000[diff] [blame]439
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]440</div>
441
442<!-- _______________________________________________________________________ -->
443<div class="doc_subsubsection">
444 Notes
445</div>
446
447<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]448<ul>
449
Chris Lattnerd09c4ec2007-05-17 22:02:24 +0000[diff] [blame]450<li><p>llvm-gcc does <b>not</b> support <tt>__builtin_apply</tt> yet.
451 See <a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</p>
452</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]453
Duncan Sands32a83442007-05-18 09:04:20 +0000[diff] [blame]454<li><p>llvm-gcc <b>partially</b> supports these GCC extensions:</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]455 <ol>
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]456 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html#Nested%20Functions">Nested Functions</a>:
457
458 As in Algol and Pascal, lexical scoping of functions.
459 Nested functions are supported, but llvm-gcc does not support
Duncan Sands0869f4a2007-09-26 16:24:52 +0000[diff] [blame]460 taking the address of a nested function (except on the X86-32 target)
Duncan Sandsc90d68b2007-09-26 15:59:54 +0000[diff] [blame]461 or non-local gotos.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]462
463 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]464
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]465 Declaring that functions have no side effects or that they can never
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]466 return.<br>
467
Anton Korobeynikovbe6fe282007-11-16 11:12:01 +0000[diff] [blame]468 <b>Supported:</b> <tt>alias</tt>, <tt>always_inline</tt>, <tt>cdecl</tt>,
469 <tt>const</tt>, <tt>constructor</tt>, <tt>destructor</tt>,
Anton Korobeynikov9413de32006-11-18 08:04:48 +0000[diff] [blame]470 <tt>deprecated</tt>, <tt>fastcall</tt>, <tt>format</tt>,
Anton Korobeynikovbe6fe282007-11-16 11:12:01 +0000[diff] [blame]471 <tt>format_arg</tt>, <tt>non_null</tt>, <tt>noinline</tt>,
472 <tt>noreturn</tt>, <tt>pure</tt>, <tt>regparm</tt>
Anton Korobeynikov8cea37b2007-01-23 12:35:46 +0000[diff] [blame]473 <tt>section</tt>, <tt>stdcall</tt>, <tt>unused</tt>, <tt>used</tt>,
474 <tt>visibility</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]475
Anton Korobeynikovbe6fe282007-11-16 11:12:01 +0000[diff] [blame]476 <b>Ignored:</b> <tt>nothrow</tt>, <tt>malloc</tt>,
477 <tt>no_instrument_function</tt></li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]478 </ol>
Chris Lattnerd09c4ec2007-05-17 22:02:24 +0000[diff] [blame]479</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]480
Chris Lattnerd09c4ec2007-05-17 22:02:24 +0000[diff] [blame]481<li><p>llvm-gcc supports the vast majority of GCC extensions, including:</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]482
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]483 <ol>
Chris Lattnerd09c4ec2007-05-17 22:02:24 +0000[diff] [blame]484 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
485 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
486 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
487 Other built-in functions.</li>
488 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
489 Specifying attributes of variables.</li>
490 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.</li>
491 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread_002dLocal.html">Thread-Local</a>: Per-thread variables.</li>
492 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
493 Arrays whose length is computed at run time.</li>
Chris Lattner7fe97dd2004-03-16 08:54:07 +0000[diff] [blame]494 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20as%20Values">Labels as Values</a>: Getting pointers to labels and computed gotos.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]495 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
496 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Typeof.html#Typeof">Typeof</a>: <code>typeof</code>: referring to the type of an expression.</li>
Tanya Lattnerca26c3e2004-06-22 03:48:17 +0000[diff] [blame]497 <li><a href="http://gcc.gnu.org/onlinedocs/gcc-3.4.0/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]498 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
499 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
500 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
501 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
502 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
503 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
504 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variadic-Macros.html#Variadic%20Macros">Variadic Macros</a>: Macros with a variable number of arguments.</li>
505 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
Chris Lattner26299222006-11-18 07:51:14 +0000[diff] [blame]506 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Extended%20Asm">Extended Asm</a>: Assembler instructions with C expressions as operands.</li>
507 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands.</li>
508 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Asm-Labels.html#Asm%20Labels">Asm Labels</a>: Specifying the assembler name to use for a C symbol.</li>
509 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Explicit-Reg-Vars.html#Explicit%20Reg%20Vars">Explicit Reg Vars</a>: Defining variables residing in specified registers.</li>
510 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html#Vector%20Extensions">Vector Extensions</a>: Using vector instructions through built-in functions.</li>
511 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Target-Builtins.html#Target%20Builtins">Target Builtins</a>: Built-in functions specific to particular targets.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]512 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Subscripting.html#Subscripting">Subscripting</a>: Any array can be subscripted, even if not an lvalue.</li>
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]513 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pointer-Arith.html#Pointer%20Arith">Pointer Arith</a>: Arithmetic on <code>void</code>-pointers and function pointers.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]514 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
John Criswelld000e1d2003-12-18 16:43:17 +0000[diff] [blame]515 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions,
516or arrays as values.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]517 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
Misha Brukmanc4b7bee2003-12-12 04:37:31 +0000[diff] [blame]518 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Cast-to-Union.html#Cast%20to%20Union">Cast to Union</a>: Casting to union type from any member of the union.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]519 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
520 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
521 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
Tanya Lattner78537e42004-12-08 18:29:38 +0000[diff] [blame]522 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Comments.html#C_002b_002b-Comments">C++ Comments</a>: C++ comments are recognized.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]523 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
524 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Character-Escapes.html#Character%20Escapes">Character Escapes</a>: <code>\e</code> stands for the character &lt;ESC&gt;.</li>
525 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
526 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
527 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alternate-Keywords.html#Alternate%20Keywords">Alternate Keywords</a>:<code>__const__</code>, <code>__asm__</code>, etc., for header files.</li>
528 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Incomplete-Enums.html#Incomplete%20Enums">Incomplete Enums</a>: <code>enum foo;</code>, with details to follow.</li>
529 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html#Function%20Names">Function Names</a>: Printable strings which are the name of the current function.</li>
Chris Lattner25795bc2004-02-14 04:08:29 +0000[diff] [blame]530 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Return-Address.html#Return%20Address">Return Address</a>: Getting the return or frame address of a function.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]531 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Unnamed-Fields.html#Unnamed%20Fields">Unnamed Fields</a>: Unnamed struct/union fields within structs/unions.</li>
532 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]533 </ol></li>
534
535</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]536
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]537<p>If you run into GCC extensions which have not been included in any of these
538lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]539
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]540</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]541
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]542<!-- ======================================================================= -->
543<div class="doc_subsection">
544 <a name="c++-fe">Known problems with the C++ front-end</a>
545</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]546
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]547<div class="doc_text">
548
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]549<p>The C++ front-end is considered to be fully
Chris Lattner7506b1d2004-12-07 08:04:13 +0000[diff] [blame]550tested and works for a number of non-trivial programs, including LLVM
Chris Lattnerf3e5bc62007-05-14 06:56:09 +0000[diff] [blame]551itself, Qt, Mozilla, etc.</p>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]552
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]553<ul>
Chris Lattner000c73b2008-02-06 06:30:34 +0000[diff] [blame]554<li>Exception handling only works well on the X86 and PowerPC targets.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]555</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]556
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]557</div>
558
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]559
Chris Lattner98a493c2005-05-15 16:01:20 +0000[diff] [blame]560
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]561<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]562<div class="doc_section">
563 <a name="additionalinfo">Additional Information</a>
564</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]565<!-- *********************************************************************** -->
566
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]567<div class="doc_text">
568
Chris Lattner416db102005-05-16 17:13:10 +0000[diff] [blame]569<p>A wide variety of additional information is available on the <a
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]570href="http://llvm.org">LLVM web page</a>, in particular in the <a
571href="http://llvm.org/docs/">documentation</a> section. The web page also
Reid Spencer669ed452007-07-09 08:04:31 +0000[diff] [blame]572contains versions of the API documentation which is up-to-date with the
573Subversion version of the source code.
Misha Brukman109d9e82005-03-30 19:14:24 +0000[diff] [blame]574You can access versions of these documents specific to this release by going
575into the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]576
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]577<p>If you have any questions or comments about LLVM, please feel free to contact
Chris Lattnerc463b272005-10-29 07:07:09 +0000[diff] [blame]578us via the <a href="http://llvm.org/docs/#maillist"> mailing
Chris Lattner5eccca42003-12-12 21:22:16 +0000[diff] [blame]579lists</a>.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]580
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]581</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]582
583<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]584
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]585<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]586<address>
Misha Brukman38847d52003-12-21 22:53:21 +0000[diff] [blame]587 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]588 src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
589 <a href="http://validator.w3.org/check/referer"><img
590 src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
591
Chris Lattnerb4b0ce72007-05-18 00:44:29 +0000[diff] [blame]592 <a href="http://llvm.org/">LLVM Compiler Infrastructure</a><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]593 Last modified: $Date$
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]594</address>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]595
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]596</body>
597</html>